It’s not as bad as you’d think, though I’m with you that it’s better to make a whole string if you can.
Jensen made a video on how to do it but I can’t find it.
But how you do it is you tie two Polyester strings together and the cut off the excess, after that pull it tight and take a lighter to the knot to melt it a bit (Shouldn’t take more then a solid second.) so the knot won’t come undone.